Double Commander is afree cross platform open source file manager withtwo panels side by side. It is inspired by Total Commander and featuresnew ideas.
Some key features
Internal text editor (F4) with syntax hightlighting
Built in file viewer (F3) to view files of in hex, binary or text format
Archives are handled like subdirectories. You can easily copy files to and from archives. Supported archive types: ZIP, TAR, GZ, BZ2, XZ, LZMA, 7Z and also RPM, CPIO, DEB, RAR, ZIPX
Extended search function with full text search in any files
Configurable button bar to start external programs or internal menu commands
Total Commander WCX, WDX, WFX and WLX plug-ins support
Unicode support
Most operations working in background
FTP, FTPS, FTPES, SSH+SCP and SFTP protocols support